Prevention and Control of Corn Field Tiger

This year is the worst drought in a century. Due to the drought, the tigers in Taiyi Township of Dali City are seriously affected. The ground tiger is also called the ground silkworm, the soil silkworm and the root cutter. It is a common underground pest. The life of the ground tiger can be divided into four stages: egg, larva, pupa and adult (moth). Adult body wings are dark brown. Generally speaking, the first generation larvae are seriously damaged by the ground tiger, and the life and damage habits of each instar larvae are different. The 1st and 2nd instar larvae move day and night and eat heart leaves or tender leaves; after the 3rd instar, they hide in the soil during the day and bite off the tender stems at the base of the seedlings, resulting in lack of seedlings; after the 4th instar, the drug resistance of the larvae is greatly enhanced.

Therefore, the larvae should be eliminated before the 3rd instar by chemical control. Trapping and killing adults is the best way to control the ground tiger, which can greatly reduce the number of the first generation larvae. The method is to use black light and sugar and vinegar solution to trap and kill. Weeds are not only the main places for adults to lay eggs, but also an important way for larvae to transfer to maize seedlings. Root out weeds thoroughly before corn emergence, and remove them out of the field in time for feed or retting fertilizer, do not throw them at random. Weeding will effectively depress the population base. Chemical control is still an important measure to eliminate ground tigers at present. When sowing, you can mix seeds with 50% phoxim emulsion 0.5 kg, add water 30: 50 liters and mix seeds 350: 500 kilograms. It is better to trap and kill the 4th instar larvae with poison bait. Melt 0.5 kg of 90% trichlorfon with hot water, add about 5 liters of water, spray on the fried oil dregs and stir evenly. Use 60-75 kg poison bait per hectare and spread it in the evening.